Radio sound transmitter



1,529,432 4 F. W. HQCHSTETTER RADIO sounn TRANSMITTER Filed my 1, 1923 I INVENTOR mxmxoawi BY A TTORNE Y Patented Mar. 10,- i925.

UNITED STATE Pars-r FREDERICK W. 'HOCHSTETTER, OF DAYTON, 0316.

' mic scum) Application filed May 1,

To all whom it may concern:

Be it known that I, FREDERICK W. H0011- s'm'r'mn, a citizen of the United States, and a resident of Dayton, in the county of Montb gom'ery and State of 'Ohio, have invented certain new and useful Improvements in a Radio Sound Transmitter, of which the following is a full, clear, and exactspecificationr This invention relates more particularly to In class of devices adapted to be used as a floud speaker in radio-electric systems.

My invention has for its object primarily to provide a transmitter or loud speaker deli .signedto be used on the receiver of radio- 4 electric system for regulating the volume of sound aero-impulses so that the subject matter, such as musical and other phonetic compositions, when delivered to the transmitter may tion to the listeners in low, medium and loud tones, andwhich is of a form adapted to cause the vibratory sound distributing diaphragm of the receiver to function in a man- -26 ner whereby the acoentuation of the subject matter rendered will be clear andjdistinct. The invention contemplates mainly the provision of a transmitter having a tapered annular wall with its inlet end leading from 30 the electro-magnetic sound distributing diaphragm of the radio-receiver. In the pas sage of the transn itter is a magnetized controller which is spaced from the diaphragm, and the controllerifis adjustably operative .35 for enlarging and/reducing circumferentially the course/leading from the diaphragm to the outlet ofth'etransmitter whereby the volume of sound aero impulses transmitted from the diaphragm may be regulated to 10 cause projection'of the subject matter in low, medium or loud tones as well as providing clear and distinct phonetic accentuation of the subject matter by-causing effectual vibratory action of the diaphragm by the mag 'netic influence of the controller normally at tracting the diaphragm in the direction thereof.

A further object of the invention is to provide a radio sound transmitter of a simple,

be made in any appropriate size and shape.

With these and other objects in view, the invention will be hereinafter more .fully explained with reference to the accompanying drawing forming a part of this specification efiicient and durable construction which may rmusmrrrna.

1923. Serial in. ceases.

in which similar characters of reference in dicate corresponding parts in all the views and'will then be pointed out in the claims at'the end of the description.

In the drawing, Fig. 1 is a sectional view, partly .in elevation, taken through a radio sound receiver with one form of my device applied thereto.

Fig. 2 is an enlarged detail section, partly roken away, taken on the line 22 of Fig. 1 and which shows the blades of the controller of the device in partly open positions.

Fig. 3 is an enlarged sectional view taken on the line 8-3 of ,1 and which shows the blades of the controller of the device in closed positions, and

Fig. 4 is a view similar to the view shown in Fig. 3 and which shows the blades oi? the rontroller in open positions. bemodulated in the course of projec- The device or transmitter has a tapered annular wall 10 which may be of suitable size as Well as being of any welhknown or preferred shape for servihgas a loud speaker as is incident to the use of this class of sound amplifiers in radio-electric systems. The form of the transmitter shown. in the drawing has its reduced end or inlet, as '11, arcuated, and the wall of this inlet is mounted to the casing, as 12, of a radio rcceiver,.as 13, which. may be of any of the ordinary types, enough the receiver illustrated has on the interior of casing 10 a magnet 15, which when the device is employed in a wireless system is energized by the electric impulses transmitted over conso ductive wires, as 16, 17, leading from the source"v or sound production. 'Within. the "casing 10 in proximity to the cores of the magnet and in opposition to .the inlet 11 of the transmitter is provided the usual electro-magnetic conductive diaphragm 18 adapted to be vibrated with the energizing of the magnet for distributing the sound aero-impulses to the transmitter for being magnified in Nolumc during the course of we projection of the subject matter through and fromthe transmitter to the person. within the range of hearing as is incident with the use of radio devices of this class.

In the inlet end of the wall of the trans 19s mitter is a magnetic controller 19 adapted to be adjustably operated for regulating the volume of sound aero-impulses whereby the subject matter may be rendered in clear and distinct mdillm an ha he in parts of the inner edge of the annular'plate 20 corresponding to the bottom of its recess is pivoted, at 23, one of the ends of a series of permanent magnets or blades 2-1- which. are of similar sizes and shapes, and each of the blades is preferably in the form of a fiat bar or plate of an approximately semi-circular shape curved substantially similar to the curvature of the edge of the opening 21 ot the annular plate. There may be eight of these blades, as illustrated, and their pivots are spaced at equidistances surrounding the opening 21 so that the other portions of the blades may be swung simultaneously in overlapping positions crosswise and concentrically relative to the center of the opening as well as relative to the center of the inlet 11 for expansibly and contractibly' enlarging and reducing the pas sage circnmferentially through the transmitter 15). The blades are also of sizes so that when adjustably moved to their maximum distances toward the center of the opening 21 of the supporting plate the passage through this opening and through the inlet of the transmitter will be practically closed for cutting oil the transmission of the waves of sound impulses from the. diaphragm 18 through the transmitter. With the reverse adjustment concentrically ot' the blades the passage through the opening of the supporting plate will be enlarged accordingly for allowing proportionate volumes of the waves of sound impulses to be transmitted through the inlet 11 and through the opening of the supporting plate for projection through and from the transmitter in low, medium or load tones. Each of the blades or permanent magnets 24 has its north pole, as a, pivoted to the south pole, as a. of the blade or magnet to which it is movablv connested, in order to provide a magnetic pi larity throughout all of the connected blades whereby pronounced vibratory action of the dia ihra m will e accom J'lished b r: l

the blades forming the magnetic controller 19 tending to attract the diaphragm following each vibratory movement of the dia phragm toward the cores, of the magnet 15 when energized by the electrical impulses received overthe wires 16', 17. a The sound aero impulses of the subject matter will thereby be rendered in clear and distinct ones reason of the positive electro-magmesses netic action thus imparted to the vibratory movements of the diaphragm. Across the inlet .11 of the transmitter maybe a fixed plate, as 25, in lapping arrangement on the recessed face of the supporting plate 20, and the plate is also annular in form to provide in its-center a circular opening 26 W lid} is in register with as 'w'ell'as being similar in diameter to the opening 21 of the plate 2'1 In part of the face of thegpla t'25 'surround-r iug the opening 26 is a recess 2Twhic'h com,

municateswith the recess '22 of the plate 20, and both of these recesses 'areof like diameters. v r

in order to permit the blades 24: to be" simultaneously adjusted circumferentially in clockwise relation across theope'nings of ,the plates 20, 25 a disk, as 28, is rotatably provided in the recess 27 of the plate-25 in movable arrangement on the lapping blades Ql, and in the central part of the disk is a circular opening 29 in register with as well as being of a similar diameter to the dianr eters of the openings 21' and '26 of the annular plates 20, 25. In equidistant parts lot the edge of the opening 29 ofthe annular disk 28 are'radially disposed slots. est-3f), in each of which is sl idablyl disposed the pin as 31, projecting from the second end of each of the blades 24;. When this disk is rotatably adjusted; accordinglylthe pins "3i i Will be caused to 'sliclabiymove in the Slots 30 which in turn will .adjnstably swing the blades in unison toward and from the centers. of I the registered,openings of the plates 20,- 25' and the disk 28 for varying the cirilll) cumi'erence ol the passage through the open ings and'throu gh the inlet of the transmitter to permit the volume of sound acre-impulses to be regulated] Through'part of the edge of the plate 25 and1leading fronilit's recess 2? as well as through part of the wall 10st the transmitter maybe a slot, "as 32. On the exterior of the wall of the transmitter adjacent thi's slot may be v provided a scale, as 33, having'on itse'xposed face equidistant indicating. symbols, preferably: inthe forms of numerals, as 3%, and each. of the symbols represents a dili'e'rent adjustment of the disk aln'dof the blades :24- so that the circumferential positionsof the blades rclatire toth'o center 'ot'the passage of: the inlet 'of the transmitter may be determined, exteriorly of the transmitter. v Phttending' frompart of the edge ot' the disk;28 .ot

ably through thefslot 32 is anarm o-r lev'en as 35, having on its outer end [a pointer; as 36, adapted to be movedbaclrand ti nrtlno'n i the scale 33' for indicatingseparatelyifthe symbols iii-{and projecting fromt-he lever 35 -m'ay be ahandle 37150 anon manual ad justinent of the lever and pointer for ro tatablyoperating the disk and blades according to desi: ed adjustments for modulating the volumaof sound sore-impulses of the subject matter rendered, as heroinbefore explained. l

ll hile in the foregoing description, l he've embodied the preferred form or my invention, I do not wish to be understood as limitmg niysel'l thereto, as l are. aware that rnodi fica'tions may be made therein without departing from the principle or sacrificing any of the zulvantagcs or this invention, therefore, I reserve to. myself the right to make such changes as fairly all within the scope thereof.

Having thus described my invention, 1 claim as new and desire to secure by Letlers Potent:

l. in a radio sound transrn hinuticn with the choirs-magnetic receiver thereof, of a magnetic controller operativelv spucedj'rom the diaphragm of the receiver the liaphragni in direction ittcr, the coini or airs V thereto subsequent-to each vibratory -1novemenl: of the diaphragm to the core ofthe electro-nragnet and said controller adjustable for enlarging and reducing circumferentiai y the course leading from the diaphragzn tothe outlet of the transmitter wl; creby the volume of sound acre-impulses trmilled from the diaphragm will be regulated.

2. In :1 radio sound transmitter, theconr bination with the elcctro-inagnetic receiver thereof, of a magnetic controller operativelv spaced from the diaphragm oi the receiver for eteracting the diaphragm in a direction thereto subsequent to each vibratory n1ovcnient of the diaphragm to the core of the eleclro-magnetand said controller adjustable for enlarging and reducing circumferenntially the course leading from the diaphragm to the outlet of the transmitter whereby the volume of sound acre-impulses transinirled from the diaphragm may regulated, and means operative exteriorly of (he transmitter for adjusting the controller according to determined adjustments.

3, In a radio sound transmitter, thecornbination with the electro-magnetic receiver thereof, of magnetic controller operetivcly accd Join the diaphragm of the receiver for attracting the diaphragm in a direction thereto subsequent l the diepl *agm to the core of electr'. gnet and said controller adjustable e pensibl and contractibl'y relative to the center of the passage for varying cirirniierenrialy the course leading from the 'Whercby the volume of sound aerodnipulses transmitted irom txe diaphragm may be regulated, a scale on the exterior of the hrsnsznitter hailingvariously positioned indiciating symbols, and means operative for i'she controller" according to the hi the v ,7

2:. "in rsdio sound transmitter, the comeach vibratory inovethe.

of the blades may bination with the electro-magnetic receiver thereof, ci a permanent magnet including contacting nnnulardisposed magnet blades pivoted crosswise interiorly of the wall and spaced frointhe diaphragm of the receiver for attracting the diaphragm in a direction thereto subsequent to each vibratory movement ofthe diaphragm to the core of the clectro-inagnet, said blades being simultaneously adjustable concentrically relative to the center of the passage for var curnferentially the course leading from the diaphragm to the outlet of the transmitter, and means operative blades in unison according to determined .rinents. 6. In a radio sound transmitter, the combinuiion with the electro-magnetic receiver for adjusting the thereof, of a fixed annular supporting plate spaced from the diaphragm of the'receiver, overlapping annular disposed arcuate magnet blades each having the ends of one of their poles pivoted to the opposite pole of one of the other blades and all of the blades being in concentric arrangement adjacent the i'nurginal edge of the opening of said plate whereby the other ends of the blades may be snnultaucously ad usted v concentrically relalive to the center of the opening for varying circuniferentially the course the diaphragm to the outlet of the transmitter. and means operative for adjusting ihe other ends of the blades in unison according to determined adjustments.

7. In a radio sound transmitter, the combination wifih the electro-niagnetic receiver leading from hereof,- of is lined annular supporting plate spaced $170111 the diaphragm of the receiver, overlapping annular disposed arcuate magnet lrladeseach having the ends of one of? their'poles pivoted to the opposite pole of one of the other blades and all of the, pl'iragin to the outletof the transmitter blades being; in concentric arrangement adjacent jih e {marginal edge of the opening of disk blades opposite 1 awa -Ass:

to the supporting'pijate and the disk having; This specification signed and witnessed in its inner edge/ spaced Slots-i11 each of (ibis 30th day of April, A. D. 1923.

which the Second end of each of the blades 1 1 r Q i i 1 is sli'dably pivotiad, and mean vpemtive for B RLDL'RICI HOCHSE PETER I roteitabl'y adjusting the 'di$k to move the Witnesses:

blades in unison concentrically according to F. BIXENBAUM, determmed adgustmel'i ts. J. FREDERICK Cm'm 

